That includes non-diet sodas, sports drinks and artificially sweetened water. Juice must be 100 percent fruit or vegetable juice with no added sweeteners. Diet sodas can be no more than 25 percent of the items offered, the directive says.There should be "ample choices" of water, "soy milk, rice milk and other similar dairy or non dairy milk," says the directive, which also covers fat and sugar content in vending machine snacks.It's all part of Newsom's effort to combat obesity and improve San Franciscans' health, similar to a national effort being championed by first lady Michelle Obama.The mayor's administration points to studies linking soda to obesity, including a UCLA one released last year that found adults who drink at least one soft drink a day are 27 percent more likely to be obese than those who don't, and that soda consumption is fueling the state's $41 billion annual obesity problem. The study also found that 41 percent of children and 62 percent of teens drink at least one soda daily.